In this video i am showing, how to convert a CFL bulb into a powerful rechargeable audio amplifier DIY using two 13003 transistors. The main observing feature is, that I used all available components of CFL without removing them at all with few changes in the circuit.
I used some external parts which are optional. These are used to make up for beautiful look i.e. LEDs, On/Off switch & power socket for recharging. I hope you will enjoy this project.
Following is the circuit diagram of dual 13003 transistors amplifier.
of convert cfl amplifier diy
Take any compact fluorescent bulb from scrap. It took 25 watts bulb and remove its circuit board.
If it look the same as shown, then remove all its parts except two transistors, 2 capacitors of 15uf, one 3.3k resister and a coil.
Cut down the connection of circuit board for the capacitors.
Join the two 15uf capacitors in parallel with a piece of wire as I did with a red wire. Negative points of these capacitors are already joined in the circuit. Also connect this positive point of capacitors to the base of of one transistor.
Following Main coil contain 3 coils of 3 turns each. I connected them in series and made 12 turns of coil.
The black wire shown in the following image is connecting the emitter of one transistor to the base of the second transistor. On the drawing sheet I am also showing, how I connected the 3 coils in series.
Preparing the assembly
Disconnect the four connections of the tube and emove it from its base.
Make hole in the base to make enough room to place 3.7v lithium battery cell.
Fix On/Off switch, a charging socket and two red & white LEDs on the housing of the bulb. The red led will glow when charging and the white will glow when you will turn on the power for amplifier from the On/Off switch.
I connected red LED with 150 ohms resistor in series at the plus & minus points of the charging socket. Resister will be connected to plus point and LED’s negative will go to negative point of charging socket. The plus point will send current to the battery’s positive through a diode. The positive side of the diode will face to the battery’s positive.
I used here a charge protection module from a scrap 3.7v lithium battery of mobile phone. For detail, how to get & remove this free charge protection module [click here]. Connect four piece of wires in its in & out points and connect to the battery.
Place the cell in the housing and stick it by the glue gun.
After placing the cell in the housing it will look like this.
Connect the speaker wires now. Black negative will go to the collector center pin of left transistor while the red positive will go to the collector of the right transistor. Also I connected the wires from audio jack pin. The positive two wires will go the negative of the two 15uf capacitor while the ground will go to ground.
Assembling the housing
Connect one piece of red wire from On/Off switch to the collector of right transistor and black wire from battery’s negative to ground.
Connect battery’s positive to the diode’s positive.
Test the circuit well before assembling all parts of the bulb housing.
Assemble the bulb housing gently in its proper position.
Stick the speaker at the top surface of the housing with glue gun.
Insert the audio jack to the mobile. Play music and enjoy the project. And also thank you so much for watching video and visiting the website.
List of components
used in convert CFL amplifier DIY
- 13003 transistor x 2
- 3.3k resister x 1
- 47uf capacitor x 1
- LED Red x 1
- LED White x 1
- ON/OFF Switch 12v x 1
- Charging Socket x 1
- Used/Damaged CFL x 1
- CFL Holder Base x 1